6. interrogative pronouns: who, whom, what, which, whose


Interrogative Pronouns 
source: John Graney  2011-08-30
http://www.amara.org/en/v/B3Lh/

WHO vs. WHOM - What's the Difference? 
source: Learn English Lab     2016年8月30日

The difference between 'what' and 'which' (BBC Learners' Questions)  
source: BBC Learning English       2017年2月17日
http://www.bbc.co.uk/learningenglish/...

how to use WHO, WHOM and WHOSE  
source: MrSkypelessons       2017年9月13日

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